Linux GRUB2引导修复

本教程适合debian系列系统．

必要条件：

1. /etc/default/grub（以下是默认的）

# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
#   info -f grub -n 'Simple configuration'

GRUB_DEFAULT=0
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet"
GRUB_CMDLINE_LINUX="initrd=/install/initrd.gz"

# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"

# Uncomment to disable graphical terminal (grub-pc only)
#GRUB_TERMINAL=console

# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
#GRUB_GFXMODE=640x480

# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
#GRUB_DISABLE_LINUX_UUID=true

# Uncomment to disable generation of recovery mode menu entries
#GRUB_DISABLE_RECOVERY="true"

# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"

2./etc/grub.d/（默认）

1. 00_header
2. 05_debian_theme
3. 10_linux
4. 20_linux_xen
5. 30_os-prober
6. 30_uefi-firmware
7. 40_custom
8. 41_custom

使用kali安装盘启动救援模式

可以直接打开livecd进行操作．打开终端，默认即为root然后依次输入并执行以下命令

注：sda1为所在kali分区，先挂载原系统，这里kali仅安装在一个分区中，如果有不同，请根据实际情况挂载到/mnt相应的目录下，

注意：kail中，挂载完毕以后，需要执行相应的挂载/dev,/dev/pts，/proc ,/sys,以便在子系统中可以执行相应的炒作，否则不会成功．这个和某些系统比如archlinux系统不相同．

　　# mount /dev/sda1 /mnt/
　　# mount --bind /dev /mnt/dev/
　　# mount --bind /dev/pts /mnt/dev/pts
　　# mount --bind /proc /mnt/proc
　　# mount --bind /sys /mnt/sys

转至原系统根目录

　　# chroot /mnt/

安装grub并刷新，如果有，则不用装

　　# grub-install /dev/sda

更新grub.cfg，并退至启动盘根目录

　　# update-grub
　　# exit

虽然无关紧要，但请养成一个良好的习惯，解挂

　　# umount /mnt/dev/pts
　　# umount /mnt/dev
　　# umount /mnt/proc
　　# umount /mnt/sys
　　# umount /mnt

重启电脑即可

　　# reboot